Determination of the morphology factor of oxide layers

• Published in: Electrochimica acta Vol. 47; no. 3; pp. 395 - 403
• Main Authors: Da Silva, L.M, De Faria, L.A, Boodts, J.F.C
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 31-10-2001; Elsevier
• Subjects: Capacity charge; Chemistry; Differential capacity; Electrochemistry; Exact sciences and technology; General and physical chemistry; Ionic radius; Miscellaneous; Morphology factor; Oxide films; Study of interfaces; Morphology factor; Differential capacity; Capacity charge; Ionic radius; Oxide films; Roughness; Electrode electrolyte interface; Lead IV Oxides; Voltammetry; Transition metal; Experimental study; Operating conditions; Electrodes; Morphology; Titanium; pH; Ruthenium IV Oxides; Porosity; Modified material
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/S0013-4686(01)00738-1

From the linear dependencies of the voltammetric capacitive current,
i
c, with the potential sweep rates,
ν, observed in the low and high domains, it is possible to determine the inner and outer differential capacities of oxide coatings. The morphological factor,
ϕ, defined as the ratio of the inner and total differential capacities (
C
d,i/
C
d) shows a linear relationship with the radius/ionic charge ratio of the anion of the supporting electrolyte. The dependence of the capacitive voltammetric charge,
q
c, on
ν was interpreted on the basis of a purely capacitive model for the oxide/solution interface.